[bugfix] Tab: line width can be zero

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #2081 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev    #2081   +/-   ##
=======================================
  Coverage   85.16%   85.16%           
=======================================
  Files          97       97           
  Lines        1719     1719           
  Branches      351      351           
=======================================
  Hits         1464     1464           
  Misses        207      207           
  Partials       48       48

Impacted Files	Coverage Δ
packages/tabs/index.vue	54.68% <100%> (ø)	⬆️

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